She will also meet the Charity Commission this week to discuss the regulation of organisations overseas.

Sex workers were reportedly invited to the Oxfam team house on a number of occasions.

Oxfam said it was "dismayed by what happened" and would fully cooperate with authorities.

Britain will cut off aid funding from any organisation that does not comply with a new review into charities work overseas, the country's aid minister has said.

The Times reported Friday that the government secretary responsible for charity regulation was calling for Oxfam to provide more information about the staffers who had paid for sex in Haiti.

It said an Oxfam report on the investigation stated there had been no allegations of abuse of beneficiaries and made no mention of any potential sexual crimes involving minors. It said significant improvements have already been made since 2011.

In its statement, Oxfam said it had informed its trustees, the government, as well as other major donors such as the European Union, the World Health Organization and other United Nations agencies of the investigation and the outcome. "We were not told about the nature of these events".

Oxfam Chief Executive Mark Goldring said Saturday it receives less than 10 percent of its funding from DFID and hoped to continue working with the department while rebuilding trust with the public.

The apology comes as the Department of worldwide development, which past year gave Oxfam more than £30 million, said it will review whether or not to continue to fund the charity.

During the probe, Oxfam dismissed four staff members and another three resigned, including van Hauwermeiren.

"If that organisation does not have the moral leadership to do the right thing and where they have evidence of criminal activity, to pass that information onto the relevant authorities, including prosecuting authorities, that's an absolute absence of leadership".

Ms Mordaunt announced she would meet the charity on Monday to discuss the case, and said: "If the moral leadership at the top of the organisation is not there then we can not have you as a partner".

'Our approach to this matter would have been different had the full details that have been reported been disclosed to us at the time, ' it said in a statement.

"This is now an opportunity for everyone to make sure that there are very clear, not just guidelines, but action will be taken and money will be withdrawn as well, quite frankly, if there is inappropriate behaviour", she said.

Oxfam has denied that they took part in any coverup thought according to reports they did not let the Haitian government what was happening which meant they were unable to take legal action against the employees involved.